I have a 23 speedster that runs great in low gear. However, when I let out the clutch for high gear the engine wants to die. Any thoughts or suggestions?
First thought - You may have 3:1 gears in your differential. You might try running in low to a little higher RPM prior to going to high. Be sure to close the throttle some as you let the pedal up. This may help the engine during the transition, so it doesn't stall. Again, just my initial thought.
Do you mean it bogs down? Stops firing? Coughs and sputters? Or?
How fast would you say you get it going in low gear before you upshift?
My initial guess is that you've got a misfire that you're not noticing in low since the engine is pinning so fast anyway. But, in high, the engine is turning way slower and depends on every cylinder firing the way it should. If even one cylinder isn't contributing it will buck & cough.
Also, tell us what kind of ignition you have. Distributor? Coils? Magneto? ??
That's "spinning so fast", not "pinning so fast". Duh.
The engine runs great in low gear with all cylinders firing. Then when I shift into high at about 20mph or so it seems like I've lost all power. It doesn't spit, but just starts to die. I have coils but am also running 12 volt with an alternator. Could this be the clutch adjustment?
Jayson - I'm guessing that maybe you really don't have a problem. There's no question that Model "T's, with only "low" and "high" and no gear in between was really not the best design. Even Henry Ford new and admitted it, as it is a known fact that the ONLY non-Ford accessory he actually approved of was the Ruckstell two-speed rear end. And that's because he knew that an "intermediate" gear was needed.
I think any experienced "T" driver will say that it's not unusual for a "T" engine to "stumble" a bit once in awhile between shifts, and it's usually due to not quite enough speed (RPM) reached in "low" before shifting. And higher than stock gears in the rear end would make that tendency even worse,.....FWIW,......harold
1- Open the carb another 1/4 turn CCW and try again...
2- Have more than 2" of fuel in the tank...
3- If you have a fuel filter, bypass it...
4- If you have an air filter take it off...
If any combi of the 4 don't do it, then drain the fuel, remove the fuel bowl spud face and look at the screen...
Thank you gentlemen. I will try your suggestions and respond later tomorrow.
For my speedster it's typically fuel starvation, which is not a problem unless the fuel tank is pressurized because of road vibration, warm temperatures, and/or going up a very steep hill.
For the first two issues, I do as George suggests and loosen the gas cap about 1/4 turn. For the last, I think of ways I should raise the tank next time it's off the car.
I don't think you have a clutch problem.
I like George's suggestion to open the carburetor needle valve another 1/4 turn. Sounds like you're running too lean maybe.
Is there a wire rubbing against or shorting against the peddle when in high?
We had a similar problem on our speedster, where it ran great in low, then as soon as you went to high gear it lost all power and coughed and spluttered until you pushed through and got the Rpms up a bit, then it was better.
What we did to fix it was to change the spark plugs to ones with a stronger spark, the exact model of them are NGK BP2ES, and once they were fitted it pulled like a train. Just my experience in a case like this.